Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Using Databases in Python Gettin' CRUD-y With It CRUD: Search Function

Y B
Y B
14,136 Points
Posted by Y B
Y B
14,136 Points

peewee multiple where filters

I can't get past the peewee challenge where it asks for multiple where filters. I'm not sure of the syntax - so that may be causing the issue?

crud.py 
from models import Challenge


def create_challenge(name, language, steps=1):
    Challenge.create(name=name,
                     language=language,
                     steps=steps)

def search_challenges(name, language):
    Challenge.select().where(name==name, language==language)
Y B
Y B
14,136 Points
Y B
Y B
14,136 Points

The challenge question is: Create a function named search_challenges that takes two arguments, name and language. Return all Challenges where the name field contains name argument and the language field is equal to the language argument. Use == for equality. You don't need boolean and or binary & for this, just put both conditions in your where().

1 Answer

Y B
Y B
14,136 Points
Y B
Y B
14,136 Points

The answer from the next challenge provided the answer, but I'm not exactly sure why this works. Specifically what is Challenge.language==language doing?

def search_challenges(name, language):
    return Challenge.select().where(
        Challenge.name.contains(name),
        Challenge.language==language
    )
Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points

The field objects of peewee have overloaded the equality operator and they return a peewee.Expression instead of a boolean. I assume these are used to assemble the actual query.